A staircase contains three steps each \( 10 \mathrm{~cm} \) high and \( 20 \mathrm{~cm} \) wide....

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A staircase contains three steps each \( 10 \mathrm{~cm} \) high and \( 20 \mathrm{~cm} \) wide. What should be the minimum horizontal velocity of the ball rolling off the uppermost plane so as to hit directly the lowest plane? (in \( \mathrm{m} \mathrm{s}^{-1} \) )
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